sysutils/fluent-bit: Upgrade to 3.2.4

Hard code the coro stack size to something that is expected.
Documentation states that 24576 is default [1] but FreeBSD has a
PTHREAD_MIN_SIZE of only 4 * 512, so the coro stack size is just too
small for some use cases [2].

[1] https://docs.fluentbit.io/manual/administration/configuring-fluent-bit
PR: 283299 (reported by Antti Rasinen) |2]

Release notes: https://github.com/fluent/fluent-bit/releases/tag/v3.2.4